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Molecular Sieve Desiccant
  • Quite versatile to work best in different industries
  • Can easily be reused or recycled to minimize waste
  • High quality to offer the best value for money always
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  • molecular sieve desiccant uses
  • molecular sieve desiccant types
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  • powder molecular sieve desiccant
  • molecular sieve desiccant uses
  • molecular sieve desiccant types
  • molecular sieve desiccant storage

Molecular Sieve Desiccant Manufacturer

  • High absorbent rate
  • Impressive quality 
  • The transfer rate is high
  • Get quality support
  • Impressive production capacity

Your Reliable Molecular Sieve Desiccant Manufacturer

A molecular sieve desiccant would be another popular choice for those looking for molecular sieves in the market. You do not always need to go a far looking for one when SWT can do it for you. There can be several other brands, but SWT always stands by its products in terms of being the best at absorption better. 

The adsorption process is this good because the molecule sieve is also top tier. Most people would always pick such a molecular sieve since it gives them a good performance. Still, you would find that there are thousands of reviews online on the molecular sieve. So, there is not so much to be worried about always. 

The transfer rate is also high for these molecular sieve desiccants. This transfer rate is vital in ensuring the molecular sieve will do its job quite well. Each time SWT releases a new model, we ensure that it has improvements. You would then be comfortable knowing the new release is better always. 

Because of the improved production capacity, the rate of delivery is better. Sometimes if we have the molecular sieve desiccants in the store, we will end up shipping the next day. Having a high production rate also means better delivery times. So, try out SWT today for more benefits.

  • Removal of ammonia from natural gas streams
  • Dehydration of drugs and preservatives
  • Removal of moisture in paints
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Molecular sieve desiccant packets
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Molecular sieve desiccant regeneration
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Molecular sieve desiccant shelf life
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Molecular sieve desiccant 3a
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Molecular sieve desiccant for sale
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Molecular sieve desiccant vs silica gel
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Molecular sieve desiccant bags
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Molecular sieve desiccant capacity
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Molecular sieve desiccant dehydrator
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Zeolite molecular sieve desiccant
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Molecular sieve desiccant 4a
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Drying molecular sieve desiccant

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Molecular Sieve Desiccant: The Best Adsorbents to Buy


A molecular sieve desiccant will be a popular product that different industries buy. This type of desiccant will do a good job of ensuring you can handle moisture removal better than when working with other desiccants. If you are ready for it, continue going through this molecular sieve desiccant guide to understand more about it. 

What is a Molecular Sieve Desiccant?

molecular sieve desiccant sample

The molecular sieve has a unique structure compared to what you mostly buy as desiccants. This type of desiccant would have a unique uniform structure that allows for better water crystallization. As a result, the molecular sieve desiccant will make it easier for the moisture to be adsorbed from the different materials. It is not just moisture, but also many other polar molecules. It mostly depends on what you want to remove in a process and the type of molecular sieve that you are using. 

The molecular sieve desiccants will have strong ionic forces or also known as electrostatic fields. This is possible thanks to having potassium, sodium, and calcium as cations. Depending on which cation is used, it will determine the type of molecular sieve. That is how you end up with several types such as 3A, 5A, 4A, and 13X. 

All the different classes of molecular sieve desiccants will have an impressive amount of the internal surface area. There are times the surface area can get to 1,000 m2/g. Because of the enormous amount of surface area, you can find that it is easier for the molecular sieve to adsorb as much fluids as possible. Well, it will mostly be moisture. 

The molecular sieve desiccants are also loved due to their ability to adsorb polar compounds faster even during high loading. Even when the applications involve very low concentrations, the molecular sieve desiccant will still do a good job to eliminate the contaminants. 

Molecular sieve desiccant will definitely be a nice choice for removing different types of contaminants whether they are in the gas or liquid form. This is because the molecular sieve adsorbents would easily separate the liquids and gases in relation to their molecular size and polarity. The pore or sieve cage openings will be of the same size. So, even when the impurities are different, they would still be captured if their sizes are within the range that the molecular sieve is designed to take. 

So far you should see how the molecular sieve desiccant will be an important choice for you to make. 

What are the Different Types of Molecular Sieve Desiccants?

molecular sieve desiccant types

There are many options for those who may want to buy the molecular sieve desiccants. The choice of the desiccant types is mostly based on the application of the clients. Here will be the common types of molecular sieves desiccants you can buy from SWT. 

  • 3A Molecular Sieve Desiccant 

The molecular sieve 3A desiccant will be the top choice for many industrial applications. Because of its design, the molecular sieve 3A will be good as the drying agent in the process of manufacturing gas, ethanol, and also reactive monomers

This molecular sieve will have the pore opening of size 3 angstroms. So, it would be a good choice for the listed options above. This one is also made using potassium ion-exchanging method to achieve such a good size. 

  • 4A Molecular Sieve Desiccant 

Rather than having potassium like the 3A type, this one features sodium. It too is commonly used as a drying agent too. So long as the molecules are not more than 4 angstroms, then they would be adsorbed. 

It can have more uses too. Under some special conditions, the 4A type would also be a great choice for removing carbon dioxide. So, if you are going to choose it, now you know how best you would be using the desiccant. 

  • 5A Molecular Sieve Desiccant 

This now would feature the calcium exchanged ions rather than potassium or sodium. Because of calcium, it would have larger pore openings of 5 angstroms. It works like the other two mentioned above. Provided the molecules are smaller than 5A in diameter, the 5A type will adsorb them. 

The other reason why the molecular sieve 5A desiccant is liked is because of its strong ionic forces. It would then be a perfect choice for removing carbon monoxide, carbon dioxide, moisture, and hydrogen sulphide. Some people have found more uses for the type including sieving other weakly polar molecules. 

  • The 13X Molecular Sieve Desiccant 

Having the X marker makes it different from the other desiccants above. This one is still made of sodium, but is the larger zeolite type. It would translate to having larger pore openings compared to the type A already discussed above. 

Because of the large pore openings, such sieve desiccants would be good for the removal of larger molecules that cannot fit in the pore openings of the type A desiccants. You would notice that the molecular sieve desiccant such as this one would have impressive mass transfer rates and capacity. 

The popular applications of this type of molecular sieve desiccant would be purifying oxygen. That is how you would end up with a highly purified oxygen stream as the end result. 

There will always be many other specialized molecular sieve desiccants, but those mentioned above are the popular models in most markets. Based on your use, SWT will be keen to guide you to making the right decision and help you find the proper molecular sieve desiccant. 

Where Will You Use Molecular Sieve Desiccants More Often?

Molecular sieve dessicant uses

If you are buying molecular sieves desiccants for the first time, sometimes you might not be sure how best they can be used. Not to worry as we look at the possible applications of molecular sieve desiccants. 

  • You may find such desiccants common in natural gas processing. In this application, the molecular sieve desiccant will help in dehydrating the natural gas and liquids such as butane and also propane. It would also help in removing CO2 and other impurities that may be in the natural gas. 
  • Hydrogen production and recovery is another application popular with using molecular sieve desiccants. This is where the desiccants will help in drying and subsequent purifying of the hydrogen. They would come in handy in processes such as thermal swing or the pressure swing adsorption
  • The basic petrochemical and gas processing would still be a good example of the molecular sieve desiccant use. Some of the functions the sieve would be doing is to purify the natural gas, treating of ammonia, drying of the olefin cracked gas, removing of impurities from polyolefin plant feeds. 
  • We cannot forget petroleum refining too. This refining process helps with dehydrating the light ends such as olefins for the best cryogenic recovery. Also, it helps with the overall purification of the feed going into catalytic processes such as the alkylation units, dimerization, and isomerization. 
  • How about polymer processing? You will find the molecular sieve desiccant being a good option for polymer processing too. This will include the removal of water after the urethane formulations.

The uses will always be many since the molecular sieve desiccants would also be applied in the medical world. So, always talk to SWT to get a full picture if the choice of applications actually needs the use of the molecular sieve desiccant and which type in particular. 

How are Molecular Sieve Desiccants Manufactured?

Molecular sieve dessicant manufacturing

The raw materials for manufacturing the molecular sieve desiccants include sodium hydroxide, alumina trihydrate, and sodium silicate. The three are batch-weighted and then mixed in tanks. The next step is stirring the mixture until it is homogeneous. You notice that the mixture at this point has a gel consistency. 

The gel-like mixture will be pumped straight into a crystallization tank where the technicians monitor the contents closely. The crystallization tank will also be kept at specific controlled conditions ensuring the molecular sieve desiccant formed is the right one. 

  • Filtration, washing, and exchanging 

One the first process of crystallization is done, there is the use of a rotary filter to help in separating the different types of molecular sieve discounts. Also, there will be a cationic exchange to help in determining which type of molecular sieve will be suitable for which application. 

The cationic exchange will take place in a heated tank where the filtered cake will be heated and mixed with a solution of the correctly metal salt. The metal salt determines the type of molecular sieve desiccant that would be appropriate. 

Once the exchange process is over, the formed molecular sieve desiccants will be washed and then filtered again just as you did with the original slurry. 

  • Final product formation 

Once the molecular sieve desiccant has been washed and separated, the filter cake would then be conveyed through another process to form the final product. 

Let us say the client wants pellets or beads, the crystals would then be mixed with special clay binders. The resultant mixture is then fed through the forming equipment to leave you with beads or pellets. The various products formed at this point would then be dried and fried in a kiln. The drying in a kiln is important to remove as much water as possible from the molecular sieve desiccant. 

The heating in the kiln is also important in activating the molecular sieve desiccants. To ensure they remain active, the adsorbents are then packaged immediately. Depending on how you store these molecular sieve desiccants, they can remain active at six months. 

There are several methods that can determine the overall product quality before sending the product to the client. The methods include x-ray diffraction, crush strength, density, loss on ignition, and particle size. This is all important information that the client wants to know about the product before buying. 

SWT quality control processes will be in adherence to the ISO 9000 standards. The idea is to make sure that the products are high quality and would meet the client needs at all times. 

So far, you should see that the process is not too complicated. Only that there is the need to have professionals doing it. SWT has engineers with several years of experience in the field to ensure you can find the best quality molecular sieve desiccants. 

How Does Molecular Sieve Desiccants Adsorb Based on Polarity and Molecular Size?

molecular sieve desiccant polarity

You will come across different molecular sieve desiccant types in the market. These desiccants will largely differ in their chemical composition, adsorption properties, and crystal structure. These three features will determine how the molecular sieve desiccant will operate. 

One thing to note is that the external surface of the molecular sieve will be available to all the compounds, but inside the molecular sieve desiccant is reserved for those that are small enough to get past the pore openings. 

The molecular sieve desiccant will work by adsorbing the molecules mostly based on their polarity and also the degree of unsaturation of organic molecules. Well, selectivity based on configuration and size are still important considerations too. 

Taking an example where there is a mixture of several molecules that can fit in the pores, then the molecules containing lower volatility, higher degree of unsaturation, and increased polarity will always be held tightly in the crystal. 

What is the Role of Cations in Molecular Sieve Desiccants?


The cations play a major role in determining what kind of size of pore openings you get with a molecular sieve desiccant and also how strong the adsorptive forces would be. So, the cations will be the strong localized +ve charges that will attractive the negative side electrostatically. It is for this particular reason that the greater the molecular polarity, the stronger you get the molecular sieve desiccant in attracting and adsorbing the other compounds. 

The polar molecules are those with O, N, CI, and S atoms. You would also find them being asymmetrical. It is why you may notice that carbon monoxide would be adsorbed better than argon even if the two are present in a process. 

The positive charges on the cations can also be induced in the molecules. When the molecules are polarized, there will be better electrostatic adsorption thanks to the electrostatic cation attraction. 

A quick look at the hydrocarbons shows that you are likely to find more unsaturated molecules. Such molecules are easily polarizable and make them easier to adsorb. It is why the molecular sieve desiccant would be a top choice for removing acetylene from the olefins and propylene or ethylene from hydrocarbons. 

What do the Terms Adsorption, Hysteresis, and Desorption Mean in Accordance to Molecular Sieve Desiccant?

molecular sieve desiccant adsorption principles

When seeking to buy molecular sieve desiccants, you may come across these terms. It is important to know what they mean so that you understand how the molecular sieve desiccant works. 

Whenever the molecular sieve desiccant relies on the strong physical forces to retain adsorbates rather than chemisorption, this is considered as the Langmuir-type isotherm. This is where the target compound is adsorbed rapidly leading to the saturation value faster. Such a process would also increase the pressure and concentration of the molecular sieve desiccant. 

Any further increase in the pressure will not lead to more adsorption of the compound. This is because the molecular sieve desiccant is at equilibrium. So, the chemical structure of the molecular sieve will remain unchanged. This is what we call as hysteresis effect. 

Adsorption you already know is when the molecular sieve is taking in the compounds and it is not yet fully saturated. 

Desorption is the reverse of adsorption and no hysteresis occurs during this process. You may notice that the molecular sieve desiccants may experience further adsorption whenever the pressure nears the saturation vapor pressure. This is mostly attributed to the condensation in the beads or pellets voids. 

What are the Adsorption Systems and Principles Used by Molecular Sieve Desiccants?


The molecular sieve desiccant adsorption mostly depends on a few factors. They include;

  • The rate at which the contaminant molecules can diffuses into the activated spaces within the bead or pellet of the molecular sieve desiccant. 
  • The overall size of the molecular sieve pores and the molecules
  • The adsorptive forces strength that would be between the adsorbate and the molecular sieves
  • The adsorption temperature 

Based on the factors mentioned above and type of molecular sieve desiccant, there will be up to three main types of adsorption systems. They include multiple-bed adsorption, static adsorption, and single-bed adsorption. 

  • Multiple bed adsorption 

This type of bed adsorption would be the best for commercial and large-scale purification of substances. You can get options such as conventional fixed bed and heat regenerated molecular sieve desiccant systems as part of the produces. The use of a dual-bed system is highly recommended so that you get even more performance out of the molecular sieve desiccant. 

  • Single bed adsorption 

Unlike the other model mentioned above, this would be used in places where interrupted flow of products would be tolerated. Here, once the capacity of the molecular sieves is reached, the process has to be stopped for the sieves to be regenerated first before continuing with the production. 

Depending on the age and use of your molecular sieve, some companies opt for disposing such sieves when it gets to this point.

  • Static Adsorption 

This is simply when the molecular sieve desiccants are manufactured into various physical forms that allow you to use them as static desiccants in either closed liquid or gas systems. 

The use of the various adsorption methods depends on what is the end goal. With enough help from the SWT support team, you can know which adsorption method is ideal for you. 

Why are Molecular Sieve Desiccants Deemed Highly Efficient?

molecular sieve desiccant desorption

Molecular sieve desiccants are often used in various industrial applications because of how effective they are. Here are the examples of when the molecular sieve desiccants are used effectively. 

  • Whenever there is the need for very dry streams. This is why you would see them being used whenever a need for drier gas or liquid than what you get with other commercial methods. The molecular sieve desiccants are able to reduce the moisture or water content to even less than 0.1ppm. luckily, these desiccants can also work over a large range of different conditions. 
  • Whenever an operation requires working at high temperatures, the molecular sieve desiccants would be the best choice. They are better than other desiccants such as silica gel, which do not always work best with the rise in temperature. They can operate even when the temperature is north of 200 degrees F. Also, their adsorbing capacity would be better than other adsorbents in the market. 
  • Whenever you are purifying any acidic streams, the chemical stability of molecular sieve desiccants makes it easier to work on such projects. This will include various types of materials such as inorganic gases, alcohols, ethers, ketones, and so much more. 
  • The molecular sieve desiccants are mostly stable in many organic streams. Which should make them versatile to handle many projects that might need the use of a molecular desiccant. 

What are the Popular Regeneration Cycles of Molecular Sieve Desiccants?

molecular sieve desiccant regeneration cycle

The cyclic regeneration or rather desorption is when the molecular sieve desiccants are full and there is the need to regenerate them for another use. The popular cycles used in regeneration are thermal swing, purge gas stripping, pressure swing, and displacement. 

Thermal swing cycles will reactivate when the molecular sieve desiccant is exposed to certain temperatures. They are usually high temperatures of up to 600 degrees F. At this point, the adsorption bed will be flushed with dry gas or there is a reduction in pressure. Once the regeneration is over, the temperatures are then returned to the normal adsorption conditions. 

The pressure swing cycle is different. For this cycle, the molecular sieve desiccant would be operating at a lower pressure or in a vacuum that helps with desorbing the bed. The advantage of this method is that you get faster desorbing and get back to work as soon as possible. Here gas compression is used as the main energy source to help with desorbing the molecular sieve desiccant. 

Purge gas stripping will use the non-adsorbing purge gas. This type of purge gas desorbs the molecular sieve desiccant bed through the reduction of the partial pressure of the component being adsorbed. At this point, there will be a higher operating temperature but lower operating pressure. This allows for easy stripping with the use condensable purge gas. 

The last option is the displacement cycle. Here there is the use of an adsorbable purge to help displace the material that had been adsorbed before. If the purge media adsorption performance is good, the more likely it will be to desorb it also. So, look at each of the methods and pick one that helps you get better regeneration. 



The molecular sieve desiccant that you use will mostly be based on your applications. Always go for a product that gives you the best performance generally for a molecular sieve desiccant. Since not everyone knows all the differences, the SWT customer support team can guide you more on choosing the right molecular sieve desiccant. If you are ready for more information, simply call us today.

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